cilium-cli: Validate NodePort readiness on all node IP addresses by pillai-ashwin · Pull Request #40812 · cilium/cilium

pillai-ashwin · 2025-07-30T08:19:15Z

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Description

Fixes intermittent pod-to-local-nodeport connectivity test failures (exit code 28 - connection timeout) in dual-stack clusters.

Root Cause

The upfront NodePort readiness check in deployment.go only validated HostIP (one IP per node, typically IPv4), but tests iterate through all addresses in node.Status.Addresses[] which includes both IPv4 and IPv6 in dual-stack clusters.

This meant IPv6 NodePorts were never validated for readiness, causing timeouts when tests tried them.

Fix

Enhance the upfront NodePort validation to check all node IP addresses (NodeInternalIP and NodeExternalIP types) instead of just HostIP. This ensures all addresses that will be tested are validated during setup.

Fixes: #39793

Fix intermittent NodePort connectivity test timeouts in dual-stack clusters by validating NodePort readiness on all node IP addresses during test setup.

dylandreimerink

Insufficient timeouts: 2-second connect timeout was too aggressive for IPv6 NodePort connections

IPv6 networking delays: IPv6 connections can take longer to establish than IPv4

I am a bit skeptical about these findings. Establishing a connection should not take 2 seconds, especially when all of it is effective on the same node (no internet involved). If they do, then it seems to me that something is going wrong (packets being dropped, causing TCP level retires, or something related) and increasing the timeout may just mask that.

I also have never heard of IPv6 being slower than IPv4 to establish connections. I don't think we should accept that statement without something to back that up.

Missing retry logic: Single-attempt connections failed on transient network issues

This is essentially saying that we expect Cilium, the thing we are testing to fail. I don't think that is right. These sorts of tests are exactly here to catch issues in Cilium. If the first connection we make always fails or frequently fails then we should investigate why and not plaster over it with retries. We want all connections to work, not just at least one out of three.

Premature testing: Tests started before NodePorts were fully ready

This sounds more like the right direction. I think this is more likely to be the real fix.

cilium-cli/connectivity/tests/service.go

pillai-ashwin · 2025-09-03T22:13:02Z

/test

viktor-kurchenko

Thank you!

pillai-ashwin · 2025-09-12T19:55:25Z

@viktor-kurchenko are we good to go ahead with merge?

viktor-kurchenko · 2025-09-13T07:30:33Z

/test

viktor-kurchenko · 2025-09-13T09:56:00Z

@viktor-kurchenko are we good to go ahead with merge?

Yes, it's marked as ready-to-merge now.
Thanks for the contribution!

joestringer · 2025-12-01T18:02:09Z

I see there's been some updates, but the PR title and description (release note) both talk about dropping IPv6-specific timeouts and I don't see that in the code change.

Related, in the commit message:

This removes the need for per-test readiness checks.

If the need is removed, does that mean there should be another change to remove them? Does it make sense to track that with an issue and follow up to remove those checks or were you planning to look into that as part of this PR?

pillai-ashwin · 2025-12-09T04:55:20Z

@joestringer

I see there's been some updates, but the PR title and description (release note) both talk about dropping IPv6-specific timeouts and I don't see that in the code change.

Updated the pr title, description, commit message and release note. The current approach is simpler:

The fix enhances the existing upfront NodePort validation to check all node IP addresses (NodeInternalIP and NodeExternalIP) instead of just HostIP. This covers IPv6 addresses in dual-stack clusters that were previously unchecked and were causing the intermittent timeouts.

If the need is removed, does that mean there should be another change to remove them? Does it make sense to track that with an issue and follow up to remove those checks or were you planning to look into that as part of this PR?

In an earlier version of this PR I added per-test WaitForNodePorts() calls before each curl, but I dropped that approach to favor fixing the upfront check directly. There are no per-test checks in main to remove, so no follow-up needed.

viktor-kurchenko · 2025-12-09T16:54:04Z

/test

The upfront NodePort readiness check only validated HostIP (typically one IP per node), but tests target all addresses in node.Status.Addresses which can include multiple IPs per node (e.g., IPv4 and IPv6 in dual-stack clusters). This caused intermittent failures (exit code 28) when tests tried IPv6 NodePorts that were never validated for readiness. Fix by enhancing the upfront validation in deployment.go to check NodePort readiness on all node IP addresses (InternalIP and ExternalIP types) during the setup phase, ensuring all addresses that will be tested are ready before tests execute. Fixes: cilium#39793 Signed-off-by: Ashwin Pillai <pillaiashwin96@gmail.com>

pillai-ashwin · 2025-12-13T03:36:39Z

/test

julianwiedmann · 2026-01-26T10:11:44Z

Looks like this resulted in #43749.

PR cilium#40812 added validation for NodePorts on all node IP addresses (internal and external) to fix dual-stack clusters. However, on GKE, external IPs are not reachable from inside the cluster due to firewall restrictions. The connectivity tests already skip external IPs on GKE (service.go), but the upfront validation added by cilium#40812 did not, causing timeouts during test setup. This commit adds the same GKE-aware external IP skip logic to the NodePort validation phase, making it consistent with the actual test behavior. Fixes: cilium#43749 See-also: cilium#39793 Signed-off-by: Ash <pillaiashwin96@gmail.com>

PR cilium#40812 added validation for NodePorts on all node IP addresses (internal and external) to fix dual-stack clusters. However, on GKE, external IPs are not reachable from inside the cluster due to firewall restrictions. The connectivity tests already skip external IPs on GKE, but the upfront validation added by cilium#40812 did not, causing timeouts during test setup. This commit adds the same GKE-aware external IP skip logic to the NodePort validation phase, making it consistent with the actual test behavior. Fixes: cilium#43749 See-also: cilium#39793 Signed-off-by: Ashwin Pillai <pillaiashwin96@gmail.com>

PR #40812 added validation for NodePorts on all node IP addresses (internal and external) to fix dual-stack clusters. However, on GKE, external IPs are not reachable from inside the cluster due to firewall restrictions. The connectivity tests already skip external IPs on GKE, but the upfront validation added by #40812 did not, causing timeouts during test setup. This commit adds the same GKE-aware external IP skip logic to the NodePort validation phase, making it consistent with the actual test behavior. Fixes: #43749 See-also: #39793 Signed-off-by: Ashwin Pillai <pillaiashwin96@gmail.com>

…0 ) (#584) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [aqua:cilium/cilium-cli](https://redirect.github.com/cilium/cilium-cli) | minor | `0.18.9` → `0.19.0` | --- > [!WARNING] > Some dependencies could not be looked up. Check the Dependency Dashboard for more information. --- ### Release Notes <details> <summary>cilium/cilium-cli (aqua:cilium/cilium-cli)</summary> ### [`v0.19.0`](https://redirect.github.com/cilium/cilium-cli/releases/tag/v0.19.0) [Compare Source](https://redirect.github.com/cilium/cilium-cli/compare/v0.18.9...v0.19.0) ## Summary of Changes **CI Changes:** - Add L7 policy traffic disruption tests ([cilium/cilium#42150](https://redirect.github.com/cilium/cilium/issues/42150), [@fristonio](https://redirect.github.com/fristonio)) - Cilium-cli SNI connectivity tests now retry expected successful operations to recover from failures due to external upstream issues. ([cilium/cilium#42980](https://redirect.github.com/cilium/cilium/issues/42980), [@jrajahalme](https://redirect.github.com/jrajahalme)) - cli: connectivity: fix typo in L7 LB tests ([cilium/cilium#43610](https://redirect.github.com/cilium/cilium/issues/43610), [@julianwiedmann](https://redirect.github.com/julianwiedmann)) - Fix intermittent NodePort connectivity test timeouts in dual-stack clusters by validating NodePort readiness on all node IP addresses during test setup. ([cilium/cilium#40812](https://redirect.github.com/cilium/cilium/issues/40812), [@pillai-ashwin](https://redirect.github.com/pillai-ashwin)) - tests: remove identity manager from ignored error messages ([cilium/cilium#42982](https://redirect.github.com/cilium/cilium/issues/42982), [@odinuge](https://redirect.github.com/odinuge)) **Misc Changes:** - chore(deps): update all-dependencies (main) ([cilium/cilium#43169](https://redirect.github.com/cilium/cilium/issues/43169), [@cilium-renovate](https://redirect.github.com/cilium-renovate)\[bot]) - chore(deps): update all-dependencies (main) ([cilium/cilium#43456](https://redirect.github.com/cilium/cilium/issues/43456), [@cilium-renovate](https://redirect.github.com/cilium-renovate)\[bot]) - chore(deps): update all-dependencies (main) ([cilium/cilium#43508](https://redirect.github.com/cilium/cilium/issues/43508), [@cilium-renovate](https://redirect.github.com/cilium-renovate)\[bot]) - chore(deps): update base-images (main) ([cilium/cilium#43457](https://redirect.github.com/cilium/cilium/issues/43457), [@cilium-renovate](https://redirect.github.com/cilium-renovate)\[bot]) - chore(deps): update base-images (main) ([cilium/cilium#43538](https://redirect.github.com/cilium/cilium/issues/43538), [@cilium-renovate](https://redirect.github.com/cilium-renovate)\[bot]) - chore(deps): update docker.io/library/golang:1.25.5 docker digest to [`a22b2e6`](https://redirect.github.com/cilium/cilium-cli/commit/a22b2e6) (main) ([cilium/cilium#43303](https://redirect.github.com/cilium/cilium/issues/43303), [@cilium-renovate](https://redirect.github.com/cilium-renovate)\[bot]) - chore(deps): update go to v1.25.5 (main) ([cilium/cilium#43173](https://redirect.github.com/cilium/cilium/issues/43173), [@cilium-renovate](https://redirect.github.com/cilium-renovate)\[bot]) - cilium-cli/connectivity: remove matcher for bpf/init.sh errors ([cilium/cilium#43109](https://redirect.github.com/cilium/cilium/issues/43109), [@tklauser](https://redirect.github.com/tklauser)) - cilium-cli: convert net.IP to netip.Addr ([cilium/cilium#42371](https://redirect.github.com/cilium/cilium/issues/42371), [@phuhung273](https://redirect.github.com/phuhung273)) - cli: Update `network-perf` image ref ([cilium/cilium#43297](https://redirect.github.com/cilium/cilium/issues/43297), [@HadrienPatte](https://redirect.github.com/HadrienPatte)) - chore(deps): update golangci/golangci-lint-action action to v9.2.0 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3148](https://redirect.github.com/cilium/cilium-cli/pull/3148) - Update stable release to v0.18.9 by [@michi-covalent](https://redirect.github.com/michi-covalent) in [#3149](https://redirect.github.com/cilium/cilium-cli/pull/3149) - chore(deps): update golangci/golangci-lint docker tag to v2.7.0 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3151](https://redirect.github.com/cilium/cilium-cli/pull/3151) - chore(deps): update go to v1.25.5 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3153](https://redirect.github.com/cilium/cilium-cli/pull/3153) - ci: clean up disk space in release workflow by [@tklauser](https://redirect.github.com/tklauser) in [#3154](https://redirect.github.com/cilium/cilium-cli/pull/3154) - chore(deps): update actions/stale action to v10.1.1 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3150](https://redirect.github.com/cilium/cilium-cli/pull/3150) - chore(deps): update gcr.io/distroless/static:latest docker digest to [`4b2a093`](https://redirect.github.com/cilium/cilium-cli/commit/4b2a093) by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3152](https://redirect.github.com/cilium/cilium-cli/pull/3152) - chore(deps): update golangci/golangci-lint docker tag to v2.7.2 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3155](https://redirect.github.com/cilium/cilium-cli/pull/3155) - chore(deps): update docker.io/library/golang:1.25.5 docker digest to [`a22b2e6`](https://redirect.github.com/cilium/cilium-cli/commit/a22b2e6) by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3156](https://redirect.github.com/cilium/cilium-cli/pull/3156) - chore(deps): update actions/upload-artifact action to v6 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3157](https://redirect.github.com/cilium/cilium-cli/pull/3157) - chore(deps): update docker.io/library/golang:1.25.5 docker digest to [`36b4f45`](https://redirect.github.com/cilium/cilium-cli/commit/36b4f45) by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3160](https://redirect.github.com/cilium/cilium-cli/pull/3160) - chore(deps): update dependency cilium/cilium to v1.18.5 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3159](https://redirect.github.com/cilium/cilium-cli/pull/3159) - chore(deps): update dependency kubernetes-sigs/kind to v0.31.0 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3158](https://redirect.github.com/cilium/cilium-cli/pull/3158) - chore(deps): update docker/setup-buildx-action action to v3.12.0 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3162](https://redirect.github.com/cilium/cilium-cli/pull/3162) - chore(deps): update golangci/golangci-lint docker tag to v2.8.0 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3163](https://redirect.github.com/cilium/cilium-cli/pull/3163) - chore(deps): update docker.io/library/golang:1.25.5 docker digest to [`6cc2338`](https://redirect.github.com/cilium/cilium-cli/commit/6cc2338) by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3164](https://redirect.github.com/cilium/cilium-cli/pull/3164) - chore(deps): update gcr.io/distroless/static:latest docker digest to [`cd64bec`](https://redirect.github.com/cilium/cilium-cli/commit/cd64bec) by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3165](https://redirect.github.com/cilium/cilium-cli/pull/3165) - chore(deps): update actions/setup-go action to v6.2.0 by [@renovate](https://redirect.github.com/renovate)\[bot] in [#3166](https://redirect.github.com/cilium/cilium-cli/pull/3166) - Prepare for v0.19.0 release by [@tklauser](https://redirect.github.com/tklauser) in [#3167](https://redirect.github.com/cilium/cilium-cli/pull/3167) **Full Changelog**: <cilium/cilium-cli@v0.18.9...v0.19.0> </details> --- ### Configuration 📅 **Schedule**: Branch creation - 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pillai-ashwin changed the title ~~cilium-cli: Fix IPv6 NodePort connectivity test timeouts~~ cilium-cli: NodePort tests wait for readiness; drop IPv6-specific timeouts Aug 8, 2025

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pillai-ashwin changed the title ~~cilium-cli: NodePort tests wait for readiness; drop IPv6-specific timeouts~~ cilium-cli: Validate NodePort readiness on all node IP addresses Dec 9, 2025

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cilium-cli: Fix NodePort deployment check in dual-stack clusters #43888

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julianwiedmann mentioned this pull request Jan 26, 2026

Conformance GKE: timeout reached waiting for NodePort #43749

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cilium-cli: Skip external IP NodePort validation on GKE #44014

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cilium-cli: Validate NodePort readiness on all node IP addresses#40812

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